Implement user status indicators and presence system

[anshul23102]

Description

Show user online/offline/idle status with real-time updates.\n\nImpact: 70% better awareness, improved communication.\n\nExpected: Status indicators, presence broadcast, activity tracking.\n\nLabels: enhancement, presence, realtime, GSSoC26

[anshul23102]

Closing - being refiled with proper professional template per framework standards.